Why is Tc of the oxide superconductors so low?
Why is Tc of the oxide superconductors so low?
复制标题
为什么氧化物超导体的Tc这么低？
作者：
P. Lee;N. Read
对氧化物超导体中T/sub c/以上电阻率的分析表明，非弹性散射率是kT的几倍。这种非弹性散射产生对断裂，其抑制相对于能隙的T/sub c/。这个问题中的大能量尺度表明了一种电子配对机制，我们相信这会导致d波配对。在半填充附近的二维正方晶格中，非弹性散射既有电子-声子散射的贡献，也有电子-电子散射的贡献。在后一种情况下，可以在更三维的结构中减少对断裂。
An analysis of the resistivity above T/sub c/ in the oxide superconductors shows that the inelastic-scattering rate is several times kT. This inelastic scattering yields pair breaking which suppresses T/sub c/ relative to the energy gap. The large energy scale in the problem suggests an electronic pairing mechanism, which we believe leads to d-wave pairing. The inelastic scattering has contributions from electron-phonon and from electron-electron scattering in a two-dimensional square lattice near half filling. In the latter case, the pair breaking can be reduced in a more three-dimensional structure.